NH82801ERSL8WB Intel, NH82801ERSL8WB Datasheet - Page 112
NH82801ERSL8WB
Manufacturer Part Number
NH82801ERSL8WB
Description
Manufacturer
Intel
Datasheet
1.NH82801ERSL8WB.pdf
(671 pages)
Specifications of NH82801ERSL8WB
Lead Free Status / RoHS Status
Compliant
- Current page: 112 of 671
- Download datasheet (8Mb)
Functional Description
5.5.5
5.5.5.1
5.5.5.2
5.5.5.3
112
Software Commands
There are three additional special software commands that the DMA controller can execute. The
three software commands are:
They do not depend on any specific bit pattern on the data bus.
Clear Byte Pointer Flip-Flop
This command is executed prior to writing or reading new address or word count information to/
from the DMA controller. This initializes the flip-flop to a known state so that subsequent accesses
to register contents by the microprocessor will address upper and lower bytes in the correct
sequence.
When the host processor is reading or writing DMA registers, two Byte Pointer flip-flops are used;
one for channels 0–3 and one for channels 4–7. Both of these act independently. There are separate
software commands for clearing each of them (0Ch for channels 0–3, 0D8h for channels 4–7).
DMA Master Clear
This software instruction has the same effect as the hardware reset. The Command, Status,
Request, and Internal First/Last Flip-Flop registers are cleared and the Mask register is set. The
DMA controller enters the idle cycle.
There are two independent master clear commands; 0Dh that acts on channels 0–3, and 0DAh that
acts on channels 4–7.
Clear Mask Register
This command clears the mask bits of all four channels, enabling them to accept DMA requests.
I/O port 00Eh is used for channels 0–3 and I/O port 0DCh is used for channels 4–7.
•
•
•
Clear Byte Pointer Flip-Flop
Master Clear
Clear Mask Register
Intel
®
82801EB ICH5 / 82801ER ICH5R Datasheet
Related parts for NH82801ERSL8WB
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Microprocessor: Intel Celeron M Processor 320 and Ultra Low Voltage Intel Celeron M Processor at 600MHz
Manufacturer:
Intel Corporation
Part Number:
Description:
Intel 82550 Fast Ethernet Multifunction PCI/CardBus Controller
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 120 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 120 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 64 Mbit. Access speed 150 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel StrataFlash memory 32 Mbit. Access speed 100 ns
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
DA28F640J5A-1505 Volt Intel StrataFlash Memory
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
5 Volt Intel StrataFlash?? Memory
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
5 Volt Intel StrataFlash?? Memory
Manufacturer:
Intel Corporation
Part Number:
Description:
Intel 6300ESB I/O Controller Hub
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel 82801DB I/O Controller Hub (ICH4), Pb-Free SLI
Manufacturer:
Intel Corporation
Datasheet:
Part Number:
Description:
Intel 82801FB I/O Controller Hub (ICH6)
Manufacturer:
Intel Corporation
Datasheet: